RM0453 Rev 5 159/1450
RM0453 Sub-GHz radio (SUBGHZ)
227
frequency, f
rf
is the received signal and f
if
is the intermediate frequency). The wanted signal
is located at f
rf
= f
lo
+ f
if
.
The receiver features automatic I and Q calibration, that improves image rejection. The
calibration is done automatically at startup before using the receiver, and can be requested
by command (see Image calibration for specific frequency bands for more details).
The receiver supports LoRa and (G)FSK modulations.
5.3.5 RF-PLL
The RF-PLL is used as the frequency synthesizer for the generation of the local oscillator
frequency (f
lo
) for both transmit and receive chains. The RF-PLL uses auto calibration and
uses the 32 MHz HSE32 reference. The sub-GHz radio covers all continuous frequencies in
the range between 150 to 960 MHz.
5.3.6 Intermediate frequencies
The sub-GHz radio receiver operates mostly in low-IF configuration, except for specific high-
bandwidth settings.
Table 28. FSK mode intermediate frequencies
Setting name Bandwidth (kHz) f
if
(kHz)
RX_BW_467 467.0
250
RX_BW_234 234.3
RX_BW_117 117.3
RX_BW_58 58.6
RX_BW_29 29.3
RX_BW_14 14.6
RX_BW_7 7.3
RX_BW_373 373.6
200
RX_BW_187 187.2
RX_BW_93 93.8
RX_BW_46 46.9
RX_BW_23 23.4
RX_BW_11 11.7
RX_BW_5 5.8
RX_BW_312 312.0
167
RX_BW_156 156.2
RX_BW_78 78.2
RX_BW_39 39.0
RX_BW_19 19.5
RX_BW_9 9.7
RX_BW_4 4.8
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